Finding the Fourth Proportional to 1,162.05, 1,603.30 and 899.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,162.05 : 1,603.30 = 899.61 : x
2. Step 2: Convert to fraction form
   1,162.05/1,603.30 = 899.61/x
3. Step 3: Cross multiply
   1,162.05x = 1,603.30 × 899.61
4. Step 4: Simplify right side
   1,162.05x = 1,442,344.71
5. Step 5: Solve for x
   x = 1,442,344.71/1,162.05
6. Step 6: Final answer
   x = 1,241.21